SIM800_Hardware Design_V1.09

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1 SIM800_Hardware Design_V1.09

2 Document Title SIM800 Hardware Design Version 1.09 Date Status Document Control ID Release SIM800_Hardware Design_V1.09 General Notes SIMCom offers this information as a service to its customers, to support application and engineering efforts that use the products designed by SIMCom. The information provided is based upon requirements specifically provided to SIMCom by the customers. SIMCom has not undertaken any independent search for additional relevant information, including any information that may be in the customer s possession. Furthermore, system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator. All specifications supplied herein are subject to change. Copyright This document contains proprietary technical information which is the property of SIMCom Limited, copying of this document and giving it to others and the using or communication of the contents thereof, are forbidden without express authority. Offenders are liable to the payment of damages. All rights reserved in the event of grant of a patent or the registration of a utility model or design. All specification supplied herein are subject to change without notice at any time. Copyright Shanghai SIMCom Wireless Solutions Ltd SIM800_Hardware Design_V

3 Contents 1. Introduction SIM800 Overview SIM800 Key Features Operating Modes SIM800 Functional Diagram Package Information Pin Out Diagram Pin Description Package Dimensions Application Interface Power Supply Power Supply Pin Monitoring Power Supply Power on/off SIM Power on SIM Power off SIM Reset Function Power Saving Mode Function Mode Sleep Mode (AT+CSCLK=1) Wake Up SIM800 from Sleep Mode (AT+CSCLK=1) RTC Backup Serial Port and USB Interface Function of Serial Port Serial Port USB Interface Software Upgrade and Debug RI Behaviors Audio Interfaces Speaker Interfaces Configuration Microphone Interfaces Configuration Audio Electronic Characteristic TDD Bluetooth SIM Card Interface SIM Card Application SIM Card Design Consideration Design Considerations for SIM Card Holder PCM Interface PCM Interface Keypad Interface I2C BUS General Purpose Input/Output (GPIO) ADC SIM800_Hardware Design_V

4 4.15. PWM Network Status Indication Operating Status Indication KPLED RF Synchronization Signal Antenna Interface GSM Antenna Interface Bluetooth Antenna Interface PCB Layout PIN Assignment Principle of PCB Layout Antenna Power Supply SIM Card Interface Audio Interface Others Recommended PCB Layout Electrical, Reliability and Radio Characteristics Absolute Maximum Ratings Recommended Operating Conditions Digital Interface Characteristics SIM Card Interface Characteristics SIM_VDD Characteristics VDD_EXT Characteristics VRTC Characteristics Current Consumption (VBAT=4V) Electro-Static Discharge Radio Characteristics Module RF Receive Sensitivity Module Operating Frequencies Manufacturing Top and Bottom View of SIM Typical Solder Reflow Profile The Moisture Sensitivity Level Baking Requirements Appendix I. Related Documents II. Terms and Abbreviations III. Safety Caution SIM800_Hardware Design_V

5 Table Index TABLE 1: SIM800 KEY FEATURES TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE TABLE 3: OVERVIEW OF OPERATING MODES TABLE 4: PIN DESCRIPTION TABLE 5: RECOMMENDED ZENER DIODE TABLE 6: ELECTRONIC CHARACTERISTIC OF THE RESET PIN TABLE 7: THE CURRENT CONSUMPTION OF FUNCTION MODES (BS-PA-MFRMS=5) TABLE 8: SERIAL PORT AND USB PIN DEFINITION TABLE 9: SERIAL PORT CHARACTERISTICS TABLE 10: USB_VBUS OPERATION VOLTAGE TABLE 11: RI BEHAVIORS TABLE 12: AUDIO INTERFACE DEFINITION TABLE 13: MICROPHONE INPUT CHARACTERISTICS TABLE 14: AUDIO OUTPUT CHARACTERISTICS TABLE 15: SIM PIN DEFINITION TABLE 16: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) TABLE 17: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) TABLE 18: PCM PIN DEFINITION TABLE 19: PCM SPECIFICATION TABLE 20: PIN DEFINITION OF THE KEYPAD INTERFACE TABLE 21: PIN DEFINITION OF THE I2C TABLE 22: PIN DEFINITION OF THE GPIO TABLE 23: PIN DEFINITION OF THE ADC TABLE 24: ADC SPECIFICATION TABLE 25: PIN DEFINITION OF THE PWM TABLE 26: PWM OUTPUT CHARACTERISTICS TABLE 27: PWM MULTIPLEX FUNCTION TABLE 28: PIN DEFINITION OF THE NETLIGHT TABLE 29: STATUS OF THE NETLIGHT PIN TABLE 30: PIN DEFINITION OF THE STATUS TABLE 31: PIN DEFINITION OF THE KPLED TABLE 32: KPLED SPECIFICATION TABLE 33: DEFINITION OF THE RF_SYNC PIN TABLE 34: RECOMMENDATION OF ESD COMPONENT TABLE 35: ABSOLUTE MAXIMUM RATINGS TABLE 36: RECOMMENDED OPERATING CONDITIONS TABLE 37: DIGITAL INTERFACE CHARACTERISTICS TABLE 38: SIM CARD INTERFACE CHARACTERISTIC TABLE 39: SIM_VDD CHARACTERISTICS TABLE 40: VDD_EXT CHARACTERISTICS TABLE 41: VRTC CHARACTERISTICS TABLE 42: CURRENT CONSUMPTION TABLE 43: THE ESD CHARACTERISTICS (TEMPERATURE: 25 C, HUMIDITY: 45 %) TABLE 44: GSM 900 AND GSM 850 CONDUCTED RF OUTPUT POWER TABLE 45: DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER TABLE 46: CONDUCTED RF RECEIVE SENSITIVITY SIM800_Hardware Design_V

6 TABLE 47: OPERATING FREQUENCIES TABLE 48: MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE TABLE 49: BAKING REQUIREMENTS TABLE 50: RELATED DOCUMENTS TABLE 51: TERMS AND ABBREVIATIONS TABLE 52: SAFETY CAUTION SIM800_Hardware Design_V

7 Figure Index FIGURE 1: SIM800 FUNCTIONAL DIAGRAM FIGURE 2: SIM800 PIN OUT DIAGRAM (TOP VIEW) FIGURE 3: DIMENSIONS OF SIM800 (UNIT: MM) FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT FIGURE 6: REFERENCE CIRCUIT OF THE POWER SUPPLY FIGURE 7: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY FIGURE 8: VBAT VOLTAGE DROP DURING TRANSMIT BURST FIGURE 9: THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP FIGURE 10: POWER ON/OFF MODULE USING TRANSISTOR FIGURE 11: POWER ON/OFF MODULE USING BUTTON FIGURE 12: TIMING OF POWER ON MODULE FIGURE 13: TIMING OF POWER OFF SIM800 BY PWRKEY FIGURE 14: RESET CIRCUIT FIGURE 15: RESET TIMING SEQUENCE FIGURE 16: RTC SUPPLY FROM CAPACITOR FIGURE 17: RTC SUPPLY FROM NON-CHARGEABLE BATTERY FIGURE 18: RTC SUPPLY FROM RECHARGEABLE BATTERY FIGURE 19: CONNECTION OF THE SERIAL PORT FIGURE 20: LEVEL CONVERTING BY RESISTOR FIGURE 21: ISOLATION CIRCUIT BY DIODES FIGURE 22: TX LEVEL CONVERTING BY TRANSISTOR FIGURE 23: RX LEVEL CONVERTING BY TRANSISTOR FIGURE 24: USB REFERENCE CIRCUIT FIGURE 25: CONNECTION FOR SOFTWARE UPGRADING FIGURE 26: RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER FIGURE 27: RI BEHAVIOUR OF DATA CALLING AS A RECEIVER FIGURE 28: RI BEHAVIOUR OF URC OR RECEIVE SMS FIGURE 29: RI BEHAVIOUR AS A CALLER FIGURE 30: SPEAKER REFERENCE CIRCUIT FIGURE 31: MICROPHONE REFERENCE CIRCUIT FIGURE 32: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER FIGURE 33: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER FIGURE 34: MOLEX SIM CARD HOLDER FIGURE 35: AMPHENOL C707 10M SIM CARD HOLDER FIGURE 36: PCM REFERENCE CIRCUIT FIGURE 37: TRADITIONAL KEYPAD REFERENCE CIRCUIT FIGURE 38: EXTENDED KEYPAD REFERENCE CIRCUIT FIGURE 39: ENHANCE THE ESD PERFORMANCE OF KEYPAD CIRCUIT FIGURE 40: KEYPAD DETECTED FIGURE 41: GPIO TIMING SEQUENCES FIGURE 42: REFERENCE CIRCUIT OF PWM DRIVE BUZZER FIGURE 43: REFERENCE CIRCUIT OF NETLIGHT FIGURE 44: KPLED DRIVER REFERENCE CIRCUIT FIGURE 45: RF_SYNC SIGNAL DURING TRANSMIT BURST FIGURE 46: GSM ANTENNA MATCHING CIRCUIT SIM800_Hardware Design_V

8 FIGURE 47: GSM SIMPLE ANTENNA MATCHING CIRCUIT FIGURE 48: BLUETOOTH ANTENNA MATCHING CIRCUIT FIGURE 49: RECOMMENDED PCB LAYOUT FIGURE 50: TOP AND BOTTOM VIEW OF SIM FIGURE 51: TYPICAL SOLDER REFLOW PROFILE SIM800_Hardware Design_V

9 Version History Date Version Description of change Author Origin Update RESET pin parameter; Update figure 12, 13, Update figure 3 and figure 23; Update chapter 7.3; Ma Honggang Teng Lili Ma Honggang Ma Honggang Update table32, correct NETLIGHT to PIN 52; Ma Honggang Update table 11 Ma Honggang Update figure 32 and figure 33, The 100nF capacitor changed; Ma Honggang Update figure 12 and 13, timing of VDD_EXT changed; Update the baudrate that SIM800 supports; Rename some pin name to follow the SIMCom naming rules; Uptade table 6, table9; Add GPIO timing sequences of figure 43; Update figure 51; Ma Honggang Update table 45 WuChengbing Update table 5,10and 12; Update figure 51; Update the chapter power supply; Update the chapter bluetooth; Update the frequency of PWM that SIM800 supports; Update figure 48 and 49,add a TVS; Update Table 38, add recommendation ESD component Delete the automatic power off function related to temperature WuChengbing LiuQiang Zhang xiuyu SIM800_Hardware Design_V

10 1. Introduction This document describes SIM800 hardware interface in great detail. This document can help user to quickly understand SIM800 interface specifications, electrical and mechanical details. With the help of this document and other SIM800 application notes, user guide, users can use SIM800 to design various applications quickly. 2. SIM800 Overview Designed for global market, SIM800 is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM800 features GPRS multi-slot class 12/ class 10 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. With a tiny configuration of 24*24*3mm, SIM800 can meet almost all the space requirements in users applications, such as M2M, smart phone, PDA and other mobile devices. SIM800 has 68 SMT pads, and provides all hardware interfaces between the module and customers boards. Support up to 5*5*2 Keypads. One full function UART port, and can be configured to two independent serial ports. One USB port can be used as debugging and firmware upgrading. Audio channels which include a microphone input and a receiver output. Programmable general purpose input and output. One SIM card interface. Support Bluetooth function. Support one PWM. PCM SIM800 is designed with power saving technique so that the current consumption is as low as 1.2mA in sleep mode. SIM800 integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer applications. For details about TCP/IP applications, please refer to document [11] SIM800 Key Features Table 1: SIM800 key features Feature Power supply Implementation 3.4V ~4.4V Power saving Typical power consumption in sleep mode is 1.2mA ( BS-PA-MFRMS=9 ) Frequency bands Transmitting power SIM800 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS SIM800 can search the 4 frequency bands automatically. The frequency bands also can be set by AT command AT+CBAND. For details, please refer to document [1]. Compliant to GSM Phase 2/2+ Class 4 (2W):GSM850,EGSM900 Class 1 (1W):DCS1800,PCS1900 GPRS connectivity GPRS multi-slot class 12(default) SIM800_Hardware Design_V

11 GPRS multi-slot class 1~12 (option) Temperature range Normal operation:-40 C ~ +85 C Storage temperature -45 C ~ +90 C GPRS data downlink transfer: max kbps GPRS data uplink transfer: max kbps Coding scheme: CS-1, CS-2, CS-3 and CS-4 GPRS PAP protocol for PPP connect Integrate the TCP/IP protocol. Support Packet Broadcast Control Channel (PBCCH) CSD Support CSD transmission CSD transmission rates:2.4,4.8,9.6,14.4 kbps USSD Unstructured Supplementary Services Data (USSD) support MT, MO, CB, Text and PDU mode SMS SMS storage: SIM card SIM interface Support SIM card: 1.8V, 3V Antenna Interface Antenna pad Speech codec modes: Half Rate (ETS 06.20) Full Rate (ETS 06.10) Audio features Enhanced Full Rate (ETS / / 06.80) Adaptive multi rate (AMR) Echo Cancellation Noise Suppression Serial port: Full modem interface with status and control lines, unbalanced, asynchronous. 1200bps to bps Can be used for AT commands for data stream Serial port and USB Support RTS/CTS hardware handshake and software ON/OFF flow control interface Multiplex ability according to GSM Multiplexer Protocol Autobauding supports baud rate from 1200 bps to bps USB interface: Can be used as debugging and firmware upgrading Phonebook Support phonebook types: SM, FD, LD, RC, ON, MC management SIM application GSM Release 99 toolkit Real time clock Support RTC Alarm function Can be set by AT command Physical Size:24*24*3mm characteristics Weight:3.2g Firmware upgrade Firmware upgrading by serial port or USB interface(recommend to use USB port) SIM800_Hardware Design_V

12 Table 2: Coding schemes and maximum net data rates over air interface Coding scheme 1 timeslot 2 timeslot 4 timeslot CS kbps 18.1kbps 36.2kbps CS kbps 26.8kbps 53.6kbps CS kbps 31.2kbps 62.4kbps CS kbps 42.8kbps 85.6kbps 2.2. Operating Modes The table below summarizes the various operating modes of SIM800. Table 3: Overview of operating modes Mode Normal operation Power off Minimum functionality mode Function Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there is no on air or hardware interrupt (such as GSM/GPRS GPIO interrupt or data on serial port). SLEEP In this case, the current consumption of module will reduce to the minimal level. In sleep mode, the module can still receive paging message and SMS. GSM Software is active. Module registered to the GSM network, and the IDLE module is ready to communicate. Connection between two subscribers is in progress. In this case, the power GSM consumption depends on network settings such as DTX off/on, TALK FR/EFR/HR, hopping sequences, antenna. Module is ready for GPRS data transfer, but no data is currently sent or GPRS received. In this case, power consumption depends on network settings STANDBY and GPRS configuration. There is GPRS data transfer (PPP or TCP or UDP) in progress. In this GPRS case, power consumption is related with network settings (e.g. power DATA control level); uplink/downlink data rates and GPRS configuration (e.g. used multi-slot settings). Normal Power off by sending the AT command AT+CPOWD=1 or using the PWRKEY. The power management unit shuts down the power supply for the baseband part of the module, and only the power supply for the RTC is remained. Software is not active. The serial port is not accessible. Power supply (connected to VBAT) remains applied. AT command AT+CFUN can be used to set the module to a minimum functionality mode without removing the power supply. In this mode, the RF part of the module will not work or the SIM card will not be accessible, or both RF part and SIM card will be closed, and the serial port is still accessible. The power consumption in this mode is lower than normal mode. SIM800_Hardware Design_V

13 2.3. SIM800 Functional Diagram The following figure shows a functional diagram of SIM800: GSM baseband engine PMU RF part Antenna interfaces Other interfaces Power Supply Power Management Unit Radio Frequency GSM BT RTC Analog Interface Digital Interface GPIOs Audio Analog Baseband Digital Baseband UART SIM ADC USB KEYPAD PCM Figure 1: SIM800 functional diagram SIM800_Hardware Design_V

14 3. Package Information 3.1. Pin Out Diagram Figure 2: SIM800 pin out diagram (Top view) SIM800_Hardware Design_V

15 3.2. Pin Description Table 4: Pin description Pin name Pin number I/O Description Comment Power supply SIM800 supplies 3 VBAT pins, and VBAT 55,56,57 I the power range is from 3.4V to 4.4V. Zener diode is Strongly Power supply should provide recommended to anti surge sufficient current so that the module on VBAT. can work normally; the peak current is nearly 2A. It is recommended to VRTC 26 I/O Power supply for RTC connect VRTC to a battery or a capacitor (e.g. 4.7uF). VDD_EXT 15 O 2.8V power output Keep floating if unused. GND 2,17,18,29,3 9,45,46,54,5 8,59,61,62,6 3,64,65 Ground Power on/off PWRKEY should be pulled low at PWRKEY 1 I least 1.2 second and then released to power on/down the module. Audio interface MICP 19 MICN 20 I Differential audio input SPKP 21 SPKN 22 O Differential audio output PCM interface PCM_OUT 6 O PCM_IN 12 I PCM_SYNC 14 O PCM interface for audio PCM_CLK 68 I Keypad interface KBC4 47 I KBC3 48 I KBC2 49 I KBC1 50 I Support up to 50 buttons (5*5*2) KBC0 51 I KBR4 40 O GND for VBAT recommend to use 62, 63, 64, 65 pin. Internally pulled up to VBAT. Keep floating if unused. Keep floating if unused. Keep floating if unused. (KBC0 can not be pulled down). SIM800_Hardware Design_V

16 KBR3 41 O KBR2 42 O KBR1 43 O KBR0 44 O GPIO GPIO17 11 I/O Programmable general purpose input GPIO19 13 I/O and output. NETLIGHT 52 O Network status Can not multiplex with STATUS 66 O Power on status GPIO function. Serial port DTR 3 I Data terminal ready RI 4 O Ring indicator DCD 5 O Data carrier detect CTS 7 O Clear to send Keep floating if unused. RTS 8 I Request to send TXD 9 O Transmit data RXD 10 I Receive data USB interface USB_VBUS 24 I USB_DP 27 I/O Debug and firmware upgrading Keep floating if unused. USB_DN 28 I/O ADC ADC 25 I 10 bit general analog to digital converter Keep floating if unused. PWM PWM0 35 O Pulse-width modulation, multiplex with GPIO. PWM1 36 O Pulse-width modulation, multiplex with GPIO. Keep floating if unused. I2C SDA 37 I/O I2C serial bus data Internal pulled up to 2.8V SCL 38 O I2C serial bus clock via 4.7KΩ SIM interface SIM_VDD 30 O Voltage supply for SIM card. Support 1.8V or 3V for SIM card All signals of SIM SIM_DATA 31 I/O SIM data input/output interface should be SIM_CLK 32 O SIM clock protected against ESD with SIM_RST 33 O SIM reset a TVS diode array. SIM_DET 34 I SIM card detection Antenna GSM_ANT 60 I/O GSM antenna port Impendence must be controlled to 50Ω. SIM800_Hardware Design_V

17 BT_ANT 53 I/O Bluetooth antenna port Impendence must be controlled to 50Ω. RF synchronization RF_SYNC 67 O RF burst synchronous signal Do not pull up Other signal RESET 16 I Reset input(active low) KPLED 23 I Drive keypad backlight SIM800_Hardware Design_V

18 3.3. Package Dimensions Figure 3: Dimensions of SIM800 (Unit: mm) SIM800_Hardware Design_V

19 Figure 4: Recommended PCB footprint outline (Unit: mm) Note: Keep copper out of area B and C. SIM800_Hardware Design_V

20 4. Application Interface 4.1. Power Supply The power supply range of SIM800 is from 3.4V to 4.4V. Recommended voltage is 4.0V. The transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A. For the VBAT input, a bypass capacitor (low ESR) such as a 100µF is strongly recommended. For the VBAT input, a 100uF Tantalum capacitor (CA low ESR) and a 1uF~10uF Ceramics capacitor CB are strongly recommended.the 33pF and 10pF capacitors can effectively eliminate the high frequency interference. A 5.1V/500mW Zener diode is strongly recommended, the diode can prevent chip from damaging by the voltage surge. These capacitors and Zener diode should be placed as close to SIM800 VBAT pins as possible. VBAT C A C B 33pF 10pF 5.1V 500mW Table 5: Recommended Zener diode Figure 5: Reference circuit of the VBAT input Vendor Part number Power(watts) Packages 1 On semi MMSZ5231BT1G 500mW SOD123 2 Prisemi PZ3D4V2H 500mW SOD323 3 Vishay MMSZ4689-V 500mW SOD123 4 Crownpo CDZ55C5V1SM 500mW 0805 The following figure is the reference design of +5V input power supply. The designed output for the power supply is 4.1V, thus a linear regulator can be used. DC INPUT C uF + C102 1uF U101 MIC Vin Vout 1 On/Off PWR_CTRL 3 GND FB 4 5 R K + C uF C nF R Ω VBAT R102 43K Figure 6: Reference circuit of the power supply SIM800_Hardware Design_V

21 If there is a high drop-out between the input and the desired output (VBAT), a DC-DC power supply will be preferable because of its better efficiency. The following figure is the reference circuit. FB101 is very important, customer can get better EMI feature with appropriate filtering bead. DC INPUT C101 + C uF U101 LM2596- ADJ 1 Vin Vout 2 On/Off GND 1uF PWR_CTRL 3 FB 4 L uH D102 C uF MBR360 + C nF R K R102 1K FB101 VBAT c Figure 7: Reference circuit of the DC-DC power supply The single 3.7V Li-ion cell battery can be connected to SIM800 VBAT pins directly. But the Ni-Cd or Ni-MH battery must be used carefully, since their maximum voltage can rise over the absolute maximum voltage of the module and damage it. When battery is used, the total impedance between battery and VBAT pins should be less than 150mΩ. The following figure shows the VBAT voltage drop at the maximum power transmit phase, and the test condition is as following: VBAT=4.0V, A VBAT bypass capacitor C A =100µF tantalum capacitor (ESR=0.7Ω), Another VBAT bypass capacitor C B =1µF. (See C A and C B in figure 5) 577us 4.615ms I VBAT Burst:2A VBAT Max:350mV Figure 8: VBAT voltage drop during transmit burst Power Supply Pin The VBAT pins are used for power input, and pin 62,63,64,65 should be connected to the power GND. VRTC pin is power supply of the RTC circuit in the module. VDD_EXT will output 2.8V when module powered up. When designing the power supply in user s application, pay special attention to power losses. Ensure that the input voltage never drop below 3.4V even when current consumption rises to 2A in the transmit burst. If the SIM800_Hardware Design_V

22 power voltage drops below 3.4V, the module may be shut down automatically. The PCB traces from the VBAT pins to the power supply must be wide enough (at least 80mil) to decrease voltage drops in the transmit burst. The power IC and the bypass capacitor should be placed to the module as close as possible. VBAT MIN:3.4V Figure 9: The minimal VBAT voltage requirement at VBAT drop Note: Hardware Power down voltage is 3.0V Monitoring Power Supply The AT command AT+CBC can be used to monitor the VBAT voltage. For details please refer to document [1] Power on/off SIM Power on SIM800 User can power on SIM800 by pulling down the PWRKEY pin at least 1.2 second and then release. This pin is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference circuit is shown as below. VBAT 100K 4.7K PWRKEY 1K Power on/off logic Turn on/off impulse 47K Module Figure 10: Power on/off module using transistor VBAT PWRKEY 100K 1K Power on/off logic Module Figure 11: Power on/off module using button The power on timing is illustrated as following figure. SIM800_Hardware Design_V

23 VBAT PWRKEY (INPUT) T>1.4s T>1.2s VIL<0.7V T=100ms VDD_EXT t>3s STATUS Serial Port Undefind Active Figure 12: Timing of power on module When power on procedure is completed, SIM800 will send following URC to indicate that the module is ready to operate at fixed baud rate. RDY This URC does not appear when autobauding function is active. Note: User can use AT command AT+IPR=x to set a fixed baud rate and save the configuration to non-volatile flash memory. After the configuration is saved as fixed baud rate, the Code RDY should be received from the serial port every time when SIM800 is powered on. For details, please refer to the chapter AT+IPR in document [1] Power off SIM800 SIM800 will be powered off in the following situations: Normal power off procedure: power off SIM800 by the PWRKEY pin. Normal power off procedure: power off SIM800 by AT command AT+CPOWD=1. Abnormal power off: over-voltage or under-voltage automatic power off Power off SIM800 by the PWRKEY Pin User can power off SIM800 by pulling down the PWRKEY pin for at least 1.5 second and then release. Please refer to the power on circuit. The power off sequence is illustrated in following figure. SIM800_Hardware Design_V

24 PWRKEY (input) VDD_EXT 1.5s<t<33s VIL<0.7V STATUS t>3s Serial port Active Undefined Figure 13: Timing of Power off SIM800 by PWRKEY Note: When module is powered off by pulling down PWRKEY, the pull down time exceeds 33 seconds will course the module power up. This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down. Before the completion of the power off procedure, the module will send URC: NORMAL POWER DOWN At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode can also be indicated by STATUS pin, which is low level at this time Power off SIM800 by AT Command SIM800 can be powered down by AT command AT+CPOWD=1. This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down. Before the completion of the power off procedure, the module will send URC: NORMAL POWER DOWN At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode can also be indicated by STATUS pin, which is at low level at this time. For details about the AT command AT+CPOWD, please refer to document [1] Over-voltage or Under-voltage Power off The module software monitors the VBAT voltage constantly. If the voltage 3.49V, the following URC will be reported: UNDER-VOLTAGE WARNNING If the voltage 4.3V, the following URC will be reported: OVER-VOLTAGE WARNNING If the voltage < 3.39V, the following URC will be reported, and the module will be automatically powered off. UNDER-VOLTAGE POWER DOWN If the voltage > 4.4V, the following URC will be reported, and the module will be automatically powered off. OVER-VOLTAGE POWER DOWN SIM800_Hardware Design_V

25 At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode can also be indicated by STATUS pin, which is low level at this time Reset Function SIM800 also have a RESET pin used to reset the module. This function is used as an emergency reset only when AT command AT+CPOWD=1 and the PWRKEY pin have no effect. User can pull the RESET pin to ground, and then the module will restart. This pin is already isolated in the module, so the external isolation is not necessary. Following figure is internal circuit of the RESET pin. RESET Circuit 2.8V 4.7K 47K RESET Module Figure 14: Reset circuit The typical value of RESET pin high level is 2.8V, so for the 3V or 3.3V, customer could use MCU s GPIO to driver this pin directly, resistor in serial the RESET signal could enhance the ESD performance but the value should not be higher than 100Ω, otherwise the level of RESET could be lower than threshold value; RESET hardware parameters can refer to the following table. Table 6: Electronic characteristic of the RESET Pin Pin name Symbol Min Typ Max Unit V IH V RESET V IL V T pull down ms The reset scenarios are illustrated in the following figures. SIM800_Hardware Design_V

26 RESET VDD_EXT t<400us t>105ms V IL <0.6V V IH >2.4V STATUS 2.7s Figure 15: Reset timing sequence 4.3. Power Saving Mode SIM800 has two power saving modes: Minimum function mode and sleep mode. The AT command AT+CSCLK=1 can be used to set SIM800 into sleep mode. The AT command AT+CFUN=<fun> can be used to set SIM800 into minimum function. When SIM800 is in sleep mode and minimum function mode, the current of module is the lowest Function Mode There are three function modes, which could be set by the AT command AT+CFUN=<fun>. The command provides the choice of the function levels <fun>=0, 1, 4. AT+CFUN=0: Minimum function. AT+CFUN=1: Full function (default). AT+CFUN=4: Flight mode (disable RF function). Table 7: The current consumption of function modes (BS-PA-MFRMS=5) <Fun> Current consumption(ma) (CSCLK=1) Minimum function mode minimizes the current consumption to the lowest level. If SIM800 is set to minimum functionality by AT+CFUN=0, the RF function and SIM card function will be disabled. In this case, the serial port is still accessible, but all AT commands correlative with RF function and SIM card function will not be accessible. For detailed information about the AT Command AT+CFUN=<fun>, please refer to document [1] Sleep Mode (AT+CSCLK=1) User can control SIM800 module to enter or exit the sleep mode (AT+CSCLK=1) by DTR signal. When DTR is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in serial port), SIM800 will enter sleep mode automatically. In this mode, SIM800 can still receive paging or SMS from SIM800_Hardware Design_V

27 network but the serial port is not accessible. Note: Autobauding is the default setting. Module can not enter sleep mode if the baud rate of MCU s serial port not synchronous with module after module power on Wake Up SIM800 from Sleep Mode (AT+CSCLK=1) When SIM800 is in sleep mode (AT+CSCLK=1), the following methods can wake up the module: Pull down DTR pin. The serial port will be active after DTR pin is pulled to low level for about 50ms. Receive a voice or data call from network. Receive a SMS from network. Receive external interrupt 4.4. RTC Backup VRTC is an input pin when the VBAT is not supplied by external power. When the VBAT power supply is in present and the backup battery is in low voltage state, VRTC can charge the backup battery. The RTC power supply of module can be provided by an external capacitor or a battery (non-chargeable or rechargeable) through the VRTC. The following figures show various reference circuits for RTC back up. External capacitor backup Module Large-capacitance Capacitor VRTC 1.5K RTC Core Figure 16: RTC supply from capacitor Non-chargeable battery backup Module Non-chargeable Backup Battery VRTC 1.5K RTC Core Figure 17: RTC supply from non-chargeable battery SIM800_Hardware Design_V

28 Rechargeable battery backup Module Rechargeable Backup Battery VRTC 1.5K RTC Core Figure 18: RTC supply from rechargeable battery Note: RTC can not be directly connected to the VBAT, VRTC refer to table Serial Port and USB Interface SIM800 provides one unbalanced asynchronous serial port. The module is designed as a DCE (Data Communication Equipment). The following figure shows the connection between module and client (DTE). Table 8: Serial port and USB pin definition Name Pin number Function DTR 3 Data terminal ready RI 4 Ring indicator DCD 5 Data carrier detect Serial Port CTS 7 Clear to send RTS 8 Request to send TXD 9 Transmit data RXD 10 Receive data USB_VBUS 24 USB power supply USB Interface USB_DP 27 USB data line positive USB_DN 28 USB data line negative Note: Hardware flow control is disabled by default. The AT command AT+IFC=2,2 can enable hardware flow control.the AT command AT+IFC=0,0 can disable hardware flow control. For more details, please refer to document [1]. Table 9: Serial port characteristics Symbol Min Max Unit V IL V V IH V V OL V V OH V SIM800_Hardware Design_V

29 4.5.1 Function of Serial Port Serial port: Full modem device. Contains data lines TXD and RXD, hardware flow control lines RTS and CTS, status lines DTR, DCD and RI. Serial port can be used for CSD FAX, GPRS service and AT communication. It can also be used for multiplex function. For details about multiplex function, please refer to table 11. Serial port supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, bps, and bps; Autobauding only supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, and bps The default setting is autobauding. Autobauding allows SIM800 to automatically detect the baud rate of the host device. Pay more attention to the following requirements: Synchronization between DTE and DCE: When DCE powers on with autobauding enabled, firstly, user must send character A or a to synchronize the baud rate. It is recommended to send AT until DTE receives the OK response, which means DTE and DCE are correctly synchronized. For more information please refer to the AT command AT+IPR. Restrictions of autobauding operation: The DTE serial port must be set at 8 data bits, no parity and 1 stop bit. The URC such as "RDY", "+CFUN: 1" and "+CPIN: READY will not be reported. Note: User can use AT command AT+IPR=x to set a fixed baud rate and the setting will be saved to non-volatile flash memory automatically. After the configuration is set as fixed baud rate, the URC such as "RDY", "+CFUN: 1" and "+CPIN: READY will be reported when SIM800 is powered on Serial Port The following figure shows the connection between module and client (DTE). SIM800_Hardware Design_V

30 Module(DCE) Serial Port UART1_TXD UART1_RXD UART1_RTS UART1_CTS UART1_DTR UART1_DCD UART1_RI GND Customer(DTE) Serial Port TXD RXD RTS CTS DTR DCD RING GND Figure 19: Connection of the serial port If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please change the resistors in the following figure from 5.6K to 14K. UART1_TXD 1K RXD UART1_RXD 1K TXD UART1_RTS 1K RTS UART1_CTS 1K CTS UART1_DTR 1K GPIO UART1_DCD 1K GPIO UART1_RI 1K EINT GND 5.6K 5.6K 5.6K GND Module DTE (3.3V) Figure 20: Level converting by resistor If the voltage of UART is 3V or3.3v, user also can use following reference circuits: VDD_EXT 10K UART1_RXD TXD UART1_TXD RXD 10K GND Module GND DTE SIM800_Hardware Design_V

31 Figure 21: Isolation circuit by diodes Note: when a diode used to isolate voltage cross, customer should notice that there s voltage drop on the diode. And the signal s voltage level should meet the customer s electrical character. The recommend diode is Schottky diode e.g. RB551V-30TE-17 and SDM20U40. If the voltage of UART is 5V on customer side, customer can use the following reference circuits: VDD_EXT Module DTE 4.7K VDD VDD_EXT 47K 4.7K UART1_TXD RXD Figure 22: TX level converting by transistor Module VDD_EXT VDD_EXT 4.7K VDD DTE 4.7K 47K UART1_RXD TXD Figure 23: RX level converting by transistor Note: The recommend Transistors part numbers are 2SC4617TLR and PBHV8115Z USB Interface USB interface supports software debug function. When power on the module, connect USB_VBUS, USB_DP, USB_DN and GND to PC, then install the driver successfully, a UART port could be recognized by the PC, customer could achieve the software Debug purpose with this UART port. The following diagram is recommended: SIM800_Hardware Design_V

32 USB_VBUS USB_ DN USB_ DP 22Ω 22Ω VBUS USB_ DN USB_DP GND Module 1uF GND USB Figure 24: USB reference circuit The maximum allowable cap load of TVS on USB data line should be less than 5pF (e.g. ESD9L5.0ST5G and ESD9M5.0ST5G). The USB_DP and USB_DN should be routed in differential traces. Note: please reserve the USB interface or test point for debug. Table 10: USB_VBUS operation voltage Pin Min Typ Max Unit USB_VBUS V Note: USB_VBUS is only used for USB inserting detection, can not be used as a power source Software Upgrade and Debug USB and UART interfaces can be used for firmware upgrade. If customer upgrading firmware via the USB port, SIM800 must be powered first, then connect USB_VBUS, USB_DP, USB_DN and GND to PC. There is no need to operate PWRKEY pin in the whole procedure, when SIM800 detects USB_VBUS and could communicate normally by USB_DP and USB_DN, module will enter USB download mode automatically. Note: When only USB_DP and USB_DN connected, no USB_VBUS, customer need to pull down KBC0 before power on the module, then press the PWRKEY button, the module will enter download mode; If customer upgrading firmware via the UART port, it is strongly recommended that reserve the TXD, RXD,GND and PWRKEY pins to IO connector for the upgrade, and PWRKEY pin should connect to GND while upgrading. Refer to the following figure for upgrading software. SIM800_Hardware Design_V

33 Module(DCE) Serial Port UART1_TXD UART1_RXD I/O Connector TXD RXD GND PWRKEY GND PWRKEY Figure 25: Connection for software upgrading The serial port supports the CMOS level. If user connects the module to the computer, the level shifter should be added between the DCE and DTE RI Behaviors Table 11: RI Behaviors State Standby Voice call Data call SMS URC RI response High The pin is changed to low. When any of the following events occur, the pin will be changed to high: (1)Establish the call (2)Hang up the call The pin is changed to low. When any of the following events occur, the pin will be changed to high: (1)Establish the call (2)Hang up the call The pin is changed to low, and kept low for 120ms when a SMS is received. Then it is changed to high. The pin is changed to low, and kept low for 120ms when some URCs are reported. Then it is changed to high. For more details, please refer to document [10]. The behavior of the RI pin is shown in the following figure when the module is used as a receiver. HIGH RI Establish the call LOW Idle Ring Hang up the call SIM800_Hardware Design_V

34 Figure 26: RI behaviour of voice calling as a receiver Smart Machine Smart Decision HIGH RI Establish the call LOW Idle Ring Hang up the call Figure 27: RI behaviour of data calling as a receiver HIGH RI 120ms LOW Idle Receive SMS URC Figure 28: RI behaviour of URC or receive SMS However, if the module is used as caller, the RI will remain high. Please refer to the following figure. HIGH RI LOW Idle Ring Establish the call Hang up the call Idle Figure 29: RI behaviour as a caller 4.7. Audio Interfaces SIM800 provides one analog input, which could be used for electret microphone. The module also provides one analog output. The output can directly drive 32Ω receiver. Table 12: Audio interface definition Pin name Pin number Function MICP 19 Audio input positive Audio channel MICN 20 Audio input negative SPKP 21 Audio output positive SPKN 22 Audio output negative SIM800_Hardware Design_V

35 AT+CMIC is used to adjust the input gain level of microphone. AT+SIDET is used to set the side-tone level. In addition, AT+CLVL is used to adjust the output gain level. For more details, please refer to document [1] In order to improve audio performance, the following reference circuits are recommended. The audio signals have to be layout according to differential signal layout rules as shown in following figures Speaker Interfaces Configuration Close to speaker 10pF 33pF 10pF 33pF ESD SPKP 10pF 33pF 10pF 33pF SPKN Module 10pF 33pF 10pF 33pF ESD Figure 30: Speaker reference circuit Microphone Interfaces Configuration These components should be placed to microphone as close as possible 10pF 33pF ESD MICP MICN Module The lines in bold type should be accorded to differential signal layout rules 10pF 10pF 33pF 33pF ESD Electret Microphone Figure 31: Microphone reference circuit Audio Electronic Characteristic Table 13: Microphone input characteristics Parameter Min Typ Max Unit Mic biasing voltage V SIM800_Hardware Design_V

36 Working Current 2 ma Input impedance(differential) KΩ Idle channel noise -67 dbm SINAD Input level:-40dbm0 29 db Input level:0dbm0 69 db Table 14: Audio output characteristics parameter Conditions Min Typ Max Unit Normal output R L =32 Ω receiver mw TDD GSM signal could interfere audio by coupling or conducting. Coupling noise could be filtered by adding 33 pf and 10pF capacitor over audio lines.33pf capacitor could eliminate noise from GSM900MHz, while 10pF capacitor could eliminate noise from DCS1800MHz frequency. Coupling noise has great relatives with PCB layout. Under some scenarios, TDD noise from GSM 900MHz frequency affects heavily, but some different story is from GSM1800MHz fervency, so customer should develop this filter solution according to field test result. GSM antenna is the key coupling interfering source of TDD noise. Pay attention to the layout of audio lines which should be far away from RF cable & antenna and VBAT pin. The bypass capacitor for filtering should be placed near module and another group placed near to connector. Conducting noise is mainly caused by the VBAT drop. If Audio PA was powered by VBAT directly, then there will be some cheep noise from SPK output easily. So, it's better to put big capacitor and ferrite bead near audio PA input. TDD noise has something to do with GND signal surely. If GND signal issued not good, lots of high-frequency noise will interfere MIC and speaker over bypass capacitor. So, take care of GND well during PCB layout Bluetooth SIM800 supports Bluetooth function, customer only needs to design the Bluetooth antenna, and then customer can operate Bluetooth conveniently by AT commands. Fully compliant with Bluetooth specification3.0 Support operation with GPS and GSM/GPRS worldwide radio systems Fully integrated PA provides 10dbm output power Up to 4 simultaneous active ACL links Support sniff mode Supports PCM interface and built-in programmable transcoders for liner voice with transmission 4.9. SIM Card Interface The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for SIM800_Hardware Design_V

37 22PF 22PF 22PF Smart Machine Smart Decision FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The SIM interface is powered from an internal regulator in the module SIM Card Application Table 15: SIM pin definition Name Pin function SIM_VDD 30 Voltage supply for SIM card. Support 1.8V or 3V SIM card SIM_DATA 31 SIM data input/output SIM_CLK 32 SIM clock SIM_RST 33 SIM reset SIM_DET 34 SIM card detection It is recommended to use an ESD protection component such as ON SEMI ( ) SMF12CT1G. The SIM peripheral circuit should be close to the SIM card socket. The reference circuit of the 8-pin SIM card holder is illustrated in the following figure. Module VDD_EXT VSIM SIM_RST SIM_CLK SIM_PRE SIM_DATA 4.7K 51R 51R 51R MOLEX VCC GND RST VPP CLK I/O PRESENCE GND SIM Card 1uF SMF12C Figure 32: Reference circuit of the 8-pin SIM card holder The SIM_DET pin is used for detection of the SIM card hot plug in. User can select the 8-pin SIM card holder to implement SIM card detection function. AT command AT+CSDT is used to enable or disable SIM card detection function. For details of this AT command, please refer to document [1]. If the SIM card detection function is not used, user can keep the SIM_DET pin open. The reference circuit of 6-pin SIM card holder is illustrated in the following figure. SIM800_Hardware Design_V

38 22PF 22PF 22PF Smart Machine Smart Decision Module VSIM SIM_RST SIM_CLK SIM_PRE SIM_DATA 51R 51R 51R SIM Card VCC GND RST VPP CLK I/O C707 10M uF SMF12C Figure 33: Reference circuit of the 6-pin SIM card holder SIM Card Design Consideration SIM card circuit is susceptible to interference, causing the SIM card failures or some other situations, so it is strongly recommended to follow these guidelines while designing: Make sure that SIM card holder should far away from GSM antenna while in PCB layout. SIM traces should keep away from RF lines, VBAT and high-speed signal lines. The traces should be as short as possible. Keep SIM holder s GND connect to main ground directly. Shielding the SIM card signal by ground well. Recommended to place a 1uF capacitor on SIM_VDD line and keep close to the holder. Add some TVS and the parasitic capacitance should not exceed 50pF, and 51Ω resistor in serials the SIM signal could enhance ESD protection Design Considerations for SIM Card Holder For 8 pins SIM card holder, SIMCom recommends to use Molex User can visit for more information about the holder. SIM800_Hardware Design_V

39 Figure 34: Molex SIM card holder Table 16: Pin description (Molex SIM card holder) Pin name Signal Description C1 SIM_VDD SIM card power supply C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C4 GND Connect to GND C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I/O C8 SIM_DET Detect SIM card presence For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M User can visit for more information about the holder. SIM800_Hardware Design_V

40 Figure 35: Amphenol C707 10M SIM card holder Table 17: Pin description (Amphenol SIM card holder) Pin name Signal Description C1 SIM_VDD SIM card power supply C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I/O PCM Interface SIM800 provides PCM interface. Table 18: PCM pin definition Pin name Pin number Description PCM_OUT 6 PCM data output PCM_IN 12 PCM data input PCM_SYNC 14 PCM synchrony PCM_CLK 68 PCM clock SIM800_Hardware Design_V

41 SIM800 PCM interface only supports master mode, data length is 16 bits (linear), and PCM clock rate is 256 KHz. Table 19: PCM Specification Feature Line Interface Format Data length PCM Clock/Sync Source PCM Clock Rate PCM Sync Format Zero Padding/Sign extension Data Ordering Specification Linear(Fixed) 16bits(Fixed) Master Mode(Fixed) 256Khz(Fixed) Short sync/long sync both support Default Zero Padding MSB/LSB both support Note: User can use AT command control PCM interface, for details please refer to document [1] PCM Interface Refer to the following figure for PCM design: PCM_IN PCM_OUT PCM_SYNC PCM_CLK GND Module PCMOUT PCMIN PCMSYNC PCMCLK GND CODEC Figure 36: PCM reference circuit Keypad Interface SIM800 consists of 5 keypad column outputs and 5 keypad row inputs, and it can support two kinds of connections, the traditional 5*5 keypad matrix and the extended 5*5*2 keypad matrix. SIM800_Hardware Design_V

42 KBC0 KBC1 KBC2 KBC3 KBC4 Module KBR0 KBR1 KBR2 KBR3 KBR4 Figure 37: Traditional keypad reference circuit Note: According to the traditional 5*5 keypad matrix, when there are unused KBCs or KBRs, user can execute AT command to define unused KBCs and KBRs as GPIO, for details please see the document [1]. Module supports a new keypad connection, it can support 5*5*2 amount 50 keypads, meet full keyboard demand, and the connection diagram is as follow: KBC0 KBC4 Module KBR0 20K 20K KBR4 Note: Do not change the 20KΩ resistor in the diagram. Figure 38: Extended keypad reference circuit Customer should add a resistor to enhance the ESD performance and the value of resistor should be less than 1KΩ, the connection diagram is shown in figure 41 as an example. SIM800_Hardware Design_V

43 KBCx <1K 20K Module KBRx Figure 39: Enhance the ESD performance of keypad circuit Module can detect two buttons pressed synchronously at both the traditional and extended keypad connection, but customer should notice that, do not assign keys which will be pressed at the same time on same KBC and KBR when implement the extended keypad design. The following figure is an example to explain this situation, CTRL and A can not be recognized if the two buttons were pressed at the same time. KBCx Module 20K KBRx Figure 40: Keypad detected Table 20: Pin definition of the keypad interface Name Pin Function Default state KBC0 51 Pull up KBC1 50 Pull down KBC2 49 Keypad matrix column Pull down KBC3 48 Pull down KBC4 47 Pull down KBR0 44 Pull down KBR1 43 Pull down KBR2 42 Keypad matrix row Pull down KBR3 41 Pull down KBR4 40 Pull down SIM800_Hardware Design_V

44 4.12. I2C BUS The SIM800 provides an I2C interface. It has the following features: Compliant master mode operation Adjustable clock speed for LS/FS mode operation Support 7-bit/10-bit addressing Support high speed mode Support slave clock extension START/STOP/REPEATED condition Manual transfer mode Multi-write per transfer (up to 8 data bytes for non-dma mode) Multi-read per transfer (up to 8 data bytes for non-dma mode) Multi-transfer per transaction Combined format transfer with length change capability Active drive/write-and I/O configuration Table 21: Pin definition of the I2C Pin name Pin number Description SCL 37 I2C serial bus clock(open drain output) SDA 38 I2C serial bus data(open drain output) Note: I2C has been pulled up to 2.8V via 4.7KΩ inside General Purpose Input/Output (GPIO) SIM800 provides 2 GPIO pins. The output voltage level of the GPIO can be set by the AT command AT+ SGPIO or AT+CGPIO. The input voltage level of the GPIO can also be read by the AT command AT+ SGPIO or AT+CGPIO. For more details, please refer to document [1]. NOTE: If you use AT+SGPIO,, <GPIO> According to the following mapping GPIO17:<GPIO>=3 GPIO19:<GPIO>=2 The Pin number table in the AT+CGPIO command under <pin> reference Table 22: Pin definition of the GPIO Pin name Pin number Reset state GPIO GPIO SIM800_Hardware Design_V

45 PWRKEY (INPUT) t<1.9s GPIO17 GPIO19 t<1.9s t<=10us Figure 41: GPIO timing sequences ADC Table 23: Pin definition of the ADC Pin name Pin number Description ADC 25 Analog to Digital Converter SIM800 provides an auxiliary ADC, which can be used to measure the voltage. Customerr can use AT command AT+CADC to read the voltage value. For details of this AT command, please refer to document [1]. Table 24: ADC specification Parameter Min Typ Max Unit Voltage range V ADC Resolution bits Sampling rate MHz ADC precision mv Note: the voltage should less than 2.8V, or the ADC may be damaged PWM Table 25: Pin definition of the PWM Pin name Pin number Description PWM0 35 PWM0 PWM1 36 PWM1 Note: SIM800 can only support 1 PWM synchronously, if customer set PIN 35 as PWM, so PIN36 can only be used as GPIO. PWM output frequency varies from 200Hz 100KHz.Two 7-bit unsigned binary parameters are used for the SIM800_Hardware Design_V

46 output period and for the duty cycle. The AT command AT + SPWM is used to set the output period and duty cycle of the PWM. For details, please refer to document [1]. A typical circuit of the PWM drives buzzer is shown in the following figure: VBAT Module PWM 4.7K 47K Table 26: PWM output characteristics Figure 42: Reference circuit of PWM drive buzzer Parameter Min Typ Max Unit Working voltage V Working current 4 16 ma Note: PWM pin must keep low when module in the boot process. Table 27: PWM multiplex function Pin name Pin number Mode 0(default) Mode 1 PWM0 35 PWM0 GPIO PWM1 36 GPIO PWM Network Status Indication Table 28: Pin definition of the NETLIGHT Pin name Pin number Description NETLIGHT 52 Network Status Indication The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in following table: Table 29: Status of the NETLIGHT pin Status Off SIM800 behavior SIM800 is not running SIM800_Hardware Design_V

47 64ms On/ 800ms Off 64ms On/ 3000ms Off 64ms On/ 300ms Off SIM800 not registered the network SIM800 registered to the network GPRS communication is established Reference circuit is recommended in the following figure: VBAT Module R NETLIGHT 4.7K 47K Figure 43: Reference circuit of NETLIGHT Operating Status Indication The STATUS pin indicates the operating status of module. The pin output high when module power on, output is low when module powered off. Table 30: Pin definition of the STATUS Pin name Pin number Description STATUS 66 Operating status indication KPLED SIM800 provides one open-drain LED driver pin. Table 31: Pin definition of the KPLED Pin name Pin number Description KPLED 23 Sink current for keypad LED Reference circuit is recommended in the following figure: SIM800_Hardware Design_V

48 VBAT Module KPLED Figure 44: KPLED driver reference circuit Table 32: KPLED specification Pin name Min Typ Max Unit KPLED - 60 ma RF Synchronization Signal The synchronization signal serves to indicate growing power consumption during the transmit burst. Table 33: Definition of the RF_SYNC pin Pin name Pin number Description RF_SYNC 67 Transmit synchronization signal Note: Do not pull up RF_SYNC. The timing of the synchronization signal is shown in the following figure. High level of the RF_SYNC signal indicates increased power consumption during transmission. 220us 577us Transmit burst RF_SYNC Figure 45: RF_SYNC signal during transmit burst Antenna Interface There are two antenna ports for SIM800, GSM antenna port named GSM_ANT and Bluetooth antenna port SIM800_Hardware Design_V

49 named BT_ANT; The RF interfaces of the two antenna ports both have the impedance of 50Ω The input impendence of the antenna should be 50Ω, and the VSWR should be less than 2. It is recommended that GSM antenna and Bluetooth antenna be placed as far as better. The isolations of the two antenna should be more than 30db NOTE: About the RF trace layout please refer to AN_SMT Module_RF_Reference Design_Guide GSM Antenna Interface There is a GSM antenna pad named GSM_ANT to connect a GSM antenna, the connection of the antenna must be decoupled from DC voltage. This is necessary because the antenna connector is DC coupled to ground via an inductor for ESD protection. The GSM antenna must be matched properly to achieve the best performance, so the matching circuit is necessary. For the purpose of static electricity, we recommend to add D101, which is a TVS, the recommendation ESD component as table 38. The connection is recommended as following: GND (Pin1) Module GSM_ANT (Pin2) connector R101 GSM ANT C101 C102 D101 GND (Pin3) Figure 46: GSM antenna matching circuit R101, C101, C102 are the matching circuit, the values depend on antenna debug result. Normally R101 is 0Ω, C101 and C102 are not mounted. The RF connector is used for conducted test. If the space between GSM_ANT pin and antenna is not enough, the matching circuit could be simplified as the following figure: GND (Pin1) Moule GSM_ANT (Pin2) R101 GSM ANT C101 C102 D101 GND (Pin3) Figure 47: GSM simple antenna matching circuit For the purpose of static electricity, we recommend to add D101, which is a TVS, the recommendation ESD component as table 38. Normally R101 is 0Ω; C101 and C102 are not mounted. Table 34: Recommendation of ESD component SIM800_Hardware Design_V

50 package model supplier 0201 LXES03AAA1-154 MuRata 0402 LXES15AAA1-153 MuRata Bluetooth Antenna Interface The module provides a Bluetooth antenna interface named BT_ANT to connect a Bluetooth antenna. The Bluetooth antenna must be matched properly to achieve best performance, so the matching circuit is necessary, the connection is recommended as the following figure: Module BT_ANT (Pin 53) R201 BT Antenna C201 C202 GND (Pin 54) Figure 48: Bluetooth antenna matching circuit R201, C201, C202 are the matching circuit, the values depend on antenna debug result. Normally R201 is 0Ω, C201 and C202 are not mounted. SIM800_Hardware Design_V

51 5. PCB Layout Usually, most electronic products with good performance are based on good PCB layout. Poor PCB layout will lead to lots of issues, like TDD noise, SIM card undetected, etc. The final solution for these problems is to redesign PCB layout. Making good PCB layout will save developing schedule and cost as well. This section will give some guidelines on PCB layout, in order to eliminate interfere or noise by greatest degree, and save product development period. 5.1 PIN Assignment Before the placement of the PCB design, customer should learn well about PIN assignment in order to get reasonable layout with so many external components. Please refer to figure 2 for the details. 5.2 Principle of PCB Layout During layout, we should pay attention to the following interfaces, like Antenna, power supply, SIM card interface, audio interface, and so on Antenna There are some suggestions for components placing and routing of GSM and Bluetooth RF traces: The RF connector is used for conducted test, so keep it as close to the GSM_ANT pin as possible; Antenna matching circuit should be closed to the antenna; Keep the RF traces as 50Ω; The RF traces should be kept far away from the high speed signals and strong disturbing source. If using a RF cable, kept it far away from SIM card, power ICs; It is recommended that GSM antenna and Bluetooth antenna be placed as far as better Power Supply Not only VBAT but also power ground is very important in layout. The positive line of VBAT should be as shorter and wider as possible. The correct flow from source to VBAT pin should go though Zener diode then huge capacitor. PIN 62, 63, 64, 65 are GND signals, and should be designed shortest layout to GND of power source SIM Card Interface SIM card holder will take much more space on board, and there has no anti-emi component inside, so, SIM card interface always be interfered. So, pay attention to this interface during layout. Ensure SIM card holder far way from antenna or RF cable. And it s better to put SIM card holder near module, And it s better to add ESD component to protect clock, data, reset and SIM_VDD signals which should be far away from power and high-speed signal. SIM800_Hardware Design_V

52 5.2.4 Audio Interface In order to avoid TDD noise, or current noise, or some other noise, the signal trace of audio should far away from antenna and power, and it is recommended to surround audio traces by ground. And do not rout audio trace and VBAT trace parallel Others It s better to trace signal lines of UART bunched, as well as signals of USB. 5.3 Recommended PCB Layout Based on above principles, recommended layout is shown in the following illustration. Figure 49: Recommended PCB layout SIM800_Hardware Design_V

53 6. Electrical, Reliability and Radio Characteristics 6.1 Absolute Maximum Ratings The absolute maximum ratings stated in following table are stress ratings under non-operating conditions. Stresses beyond any of these limits will cause permanent damage to SIM800. Table 35: Absolute maximum ratings Symbol Min Typ Max Unit VBAT V Peak Current A USB_VBUS V I I * - 4 ma I O * - 4 ma These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, LCD and PCM. 6.2 Recommended Operating Conditions Table 36: Recommended operating conditions Symbol Parameter Min Typ Max Unit VBAT Power supply voltage V T OPER Operating temperature C T STG Storage temperature C 6.3 Digital Interface Characteristics Table 37: Digital interface characteristics Symbol Parameter Min Typ Max Unit V IH High-level input voltage V V IL Low-level input voltage V V OH High-level output voltage V V OL Low-level output voltage V * These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, and PCM. SIM800_Hardware Design_V

54 6.4 SIM Card Interface Characteristics Smart Machine Smart Decision Table 38: SIM card interface characteristic Symbol Parameter Min Typ Max Unit I IH High-level input current -1-1 ua I IL Low-level input current -1-1 ua V IH V IL V OH V OL High-level input voltage V V Low-level input voltage V 0.4 V High-level output voltage V V Low-level output voltage V V 6.5 SIM_VDD Characteristics Table 39: SIM_VDD characteristics Symbol Parameter Min Typ Max Unit V O Output voltage V I O Output current ma 6.6 VDD_EXT Characteristics Table 40: VDD_EXT Characteristics Symbol Parameter Min Typ Max Unit V O Output voltage V I O Output current ma 6.7 VRTC Characteristics Table 41: VRTC Characteristics Symbol Description Min Typ Max Unit V RTC-IN VRTC input voltage V I RTC-IN VRTC input current ua V RTC-OUT VRTC output voltage V I RTC-OUT VRTC output current ma SIM800_Hardware Design_V

55 6.8 Current Consumption (VBAT=4V) Table 42: Current consumption Symbol Parameter Conditions Min Typ Max Unit Voltage V VBAT I VBAT Power drop PCL=5 350 mv Voltage ripple f>200khz mv Power off mode 150 ua Sleep mode (AT+CFUN=1): ( BS-PA-MFRMS=9 ) 1.2 ( BS-PA-MFRMS=5) 1.3 ma ( BS-PA-MFRMS=2) 2.0 Idle mode (AT+CFUN=1): EGSM ma Voice call (PCL=5): GSM EGSM ma DCS PCS Data mode GPRS (1Rx,4Tx): Average current GSM EGSM ma DCS PCS Data mode GPRS (3Rx,2Tx): GSM EGSM ma DCS PCS Data mode GPRS (4Rx,1Tx): GSM EGSM ma DCS PCS I MAX Peak current During TX burst 2.0 A * In above table the current consumption value is the typical one of the module tested in laboratory. In the mass production stage, there may be differences among each individual. SIM800_Hardware Design_V

56 6.9 Electro-Static Discharge SIM800 is an ESD sensitive component, so more attention should be paid to the procedure of handling and packaging. The ESD test results are shown in the following table. Table 43: The ESD characteristics (Temperature: 25 C, Humidity: 45 %) Pin name Contact discharge Air discharge VBAT ±5KV ±10KV GND ±5KV ±10KV RXD, TXD ±4KV ±8KV GSM_ANT ±5KV ±10KV SPKP/SPKN/MICP/MICN ±4KV ±8KV PWRKEY ±4KV ±8KV 6.10 Radio Characteristics The following table shows the module conducted output power, it is followed by the 3GPP TS technical specification requirement. Table 44: GSM 900 and GSM 850 conducted RF output power GSM850,EGSM900 PCL Nominal output power (dbm) Tolerance (db) for conditions Normal Extreme 5 33 ±2 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±5 ± ±5 ± ±5 ± ±5 ±6 SIM800_Hardware Design_V

57 Table 45: DCS 1800 and PCS 1900 conducted RF output power DCS1800,PCS1900 PCL Nominal output power (dbm) Tolerance (db) for conditions Normal Extreme 0 30 ±2 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±3 ± ±4 ± ±4 ± ±4 ± ±4 ± ±4 ± ±5 ± ±5 ± Module RF Receive Sensitivity The following table shows the SIM800 conducted receive sensitivity; it is tested under static condition. Table 46: Conducted RF receive sensitivity Frequency Receive sensitivity(typical) Receive sensitivity(max) GSM850,EGSM900 < -108dBm < -106dBm DCS1800,PCS1900 < -108dBm < -106dBm 6.12 Module Operating Frequencies The following table shows the module s operating frequency range; it is followed by the 3GPP TS technical specification requirement. Table 47: Operating frequencies Frequency Receive Transmit Channel GSM ~ 894MHz 824 ~ 849MHz 128 ~ 251 EGSM ~ 960MHz 880 ~ 915MHz 0 ~ 124, 975 ~ 1023 DCS ~ 1880MHz 1710 ~ 1785MHz 512 ~ 885 PCS ~ 1990MHz 1850 ~ 1910MHz 512 ~ 810 SIM800_Hardware Design_V

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